Robertson struggled in 2004. He was 1-1 with a 12.27 ERA in eight relief appearances with Cleveland and 4-5 with a 7.27 ERA with Triple-A Buffalo.

Robertson, 27, has had success at the big-league level.

He went 15-9 with Houston in 2003, leading all major-league rookies in wins, despite a 5.10 ERA.

Kelly, 25, split time between Triple-A Louisville and Double-A Chattanooga last year. He combined to hit .296 with 14 homers, 71 RBI and 20 steals.

Kelly was the starting quarterback at the University of Miami before turning his attention to baseball.

Hall, 23, spent all of last season rehabbing after shoulder surgery. He was 0-2 with a 6.57 ERA for the Reds in 2003. Hall, the seventh-round pick in 1998, was once considered one of the Reds' top starting prospects.